Adding click event to select option

Hi all,
My site is here https://dev.wpnwear.com/shop/tops/gradient-t-shirt/

I am trying to add a click event on any color option.

I have added following in functions.php in my theme

function ddfgn_wpn_7876565_9098_987() {
    if( wp_script_is( 'jquery', 'done' ) ) {
        ?>
        <script type="text/javascript">
            jQuery(document).ready(function() {
                jQuery("#pa_colour").change(function(){
                    //do somthing
                    //jQuery(".reset_variations").text("Color Changed");
                    alert("Hello");
                })
            });
        </script>
        <?php
    }
}
add_action( 'admin_print_footer_scripts', 'ddfgn_wpn_7876565_9098_987' );

PHP:

But it does not show any alert.

Ultimately I want to catch any click on any color and add a click event on "M" size so that all variation images loads properly.

Any help will be much appreciated!

Thank you & Regards,
Krish